Zn + 2HCI --> ZnCl2 + H2
How many moles of hydrogen can you make with 7.9 g Zn?
mol
7.90 mol
65.38 mol
0.24

Moles= mass\ relative formula mass(Ar)
moles of zinc= 7.9/30= 0.263
so we have 0.263 moles of zinc, and you need twice the amount of chlorine so therefore 0.526moles of chlorine= 0.526x 17=8.942g of chlorine
i cba to work the rest out but the most reasonable answer is 0.24 mol however if you need to use working outs, use the formula i provided earlier